NO. 1404. 



PARASITIC COPEPODS—CALIGIDM- WILSON. 



501 



lio-. 10). These rods are inclined toward each other as they proceed 

 awa}' from the ventral surface; their proximal ends are bent sharply 

 and sometimes carried a short distance alontr the ventral surface of the 

 t-arapace as in Caltgus curtus. They are articulated at the bend thus 

 made and again near the tip, making them three jointed. At the basal 

 joint the}^ are also articulated with the ventral surface of the carapace, 

 and the muscles which elevate or lower the whole mass are fastened 

 here. 



The short terminal joints curve inward and nearly meet at the mid 

 line {('aUgns ho)ilto, Lepeophtlic'inoi edwardsi). Sometimes they are 

 reenf orced here at the tip by other small rods which run in toward the 



Fig. 7.— SEroMi antenx.e, first .\nd second m.will.e axd mouth tube of .\Dri>T Caligi"s eapax. 



HIGHLY MAGNIFIED TO SHOW EXACT POSITION, RELATIONS, AND STRUCTURE. Ull"., SECOND AN- 



tenn-e; e'., exopod of first maxill.e; e"., endcjpod of second maxill.e; m., mouth: mx'.. 



FIRST MAXILL.1':: ITIX"., SECOND MAXILL.K. 



mid line parallel with the first {('(//i</i/s curtus). The lower lip is 

 stretched over this framework from side to side and projects somewliat 

 in front of the small anterior rods. It is divided at the center, and 

 the edges thus formed are fringed with a tuft of hairs fully twice the 

 length of those which fringe the rest of the mouth ()]wning (tig. 6). 

 In Ah'hioii there is a slit at either side instead of a single slit at the 

 center, and the fringe is not nmch lengthened. 



In the mem])rane of the lower lip, ])etween the marginal rods just 

 descril)ed, lies a complicated jointed fi'amework of short rods which 

 help support the membrane. Their number, arrangement, and shape 



